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Pushover Analysis for Soil-Structure Systems

Haeri, Mohammad Hassan | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44169 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghannad, Mohammad Ali
  7. Abstract:
  8. Controlling damage level of structures for an earthquake with certain intensity is the main purpose in seismic performance based design. This is done by estimating and confining the structure displacements and related global and local response parameters. Even though nonlinear time history analysis method is the most exact method for predicting seismic behavior of structures, but its application is limited because of being complex. Nonlinear static analysis procedure (Pushover analysis) which is based on analyzing the structure subjected to the incremental lateral load is an alternative method that has been recommended by recent structural codes. In order to consider the soil-structure interaction effect in pushover analysis these codes only suggest modeling of some springs with certain stiffness under the structure and don't consider any change in analysis procedure. However existence of soil under the structure affects its dynamic response in both elastic and inelastic behavior. Therefore nonlinear static procedure must be modified in order to consider these effects. To achieve this goal, at first this study focuses on modifying the pushover method in order to consider the soil-structure effect. Then pre-designed 2D frames with flexible bases are analyzed by the modified method. In this stage in order to determine nonlinear structural responses including global and local ductility, the SDOF model generated from nonlinear static analysis, is subjected to nonlinear time history analysis. Then these results are compared with responses derived from nonlinear dynamic analysis of 2D frames. The above mentioned stages are continued by readjusting nonlinear static procedure. Finally the best method is introduced by decreasing the error of nonlinear structural responses of flexible base models compared to fixed base ones
  9. Keywords:
  10. Nonlinear Static Analysis ; Ductility ; Soil-Structure Interaction ; Nonlinear Time History Analysis

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